Piston expander



May 29, 1928.

F. TEISINGER PI STON EXPANDER Filed March 21, 1927 gwumto@ Fred .Tez'11967",

Patented May 29, 1928.

FRED TEISINGER,

WATERLOO, IOWA, .ASSIGNOR OF ONEJHKALF T0 CHARLES L.

.OSTRANDER, `vOIE WATERLOO, IOWA.

PISTON EXPANDEB.

l Application iledMarc'li 21V, 1927. Serial No. 177,141.

My invention relates to improvements in piston expanders', and theobject ofl myimprovenient is to supply for'use in expanding splitpistonsof internal combustion engines, means for expanding a pistonl inthecireumferential region vdefined by a `longitudinal split extendingfrom its open end towardr its other end, a device v0f this classconstructed to operate in expanding this part ofy the piston equallythroughout in the said defined region. i. j

This object l have 'accomplished by the means which are hereinafterdescribed and claimed, and which are illustrated in the accompanyingdrawings, it being under-stood that modifications of the elements of mydc- Y vice may be made without departing vfrom the invention or thescope of its claims 1n said drawings, Fig. v,1 is an elevation of myimproved'piston expander as operatively mounted within a splitpiston,the latter being shown in kcentral vertical longitudinal section. Fig. 2is anelevation of theeXl panderzalone, taken at an angle ofl ninetydegrecs from'theelevation of saidFig. 1. Y Fig. 8 is an under plan viewof saidl piston expander. i

The numeral 21 denotes the hollow piston of an internal combustionengine such as is used in a well-known motor car, having one open andone closed end. rThis piston has at opposite sides circumferential slots22 and at 23 a longitudinal slit which extends from the open end of thecylinder to oneofsaid slots 22, the slit .i8 therefore permitting ofcircumferential expansion of that part of the piston circumferentiallywhich is defined by the limiting length of the slit 23. j

yMy piston expander comprises an elongated cylindrical transverseguideway` member 10 having stops 11 at both ends and having a transverseinteriorlythreaded opening 9 to seat a threaded rotatable shaft 1 at itsthreaded medial part 3, the upper end of the shaft being provided with atransverse handle 2 or other means thereon by which it `may beconveniently manually rotated. The lower termination 4 of said shaft isconed and has a terminal cylindrical part 5 upon which an oppositelyforked block G is loosely non-slidably mounted,

The numeral 12 denotes a like pair of guide members which arecylindrically apertured in alinement and mounted slidably upon theguideway member 10 at opposite sides-vof the shaft 1. Integral with eachguide member 12 is depending semi-cylindrical l'part 14, la widersemi-cylindrical stop member 15 and a lower semi-cylindrical diminished,partv 16. From each part 16 deprendsv a projection 18 having asegmental cylindrical outer face to fit within the cylindrical innerwall of the piston 21, the semicylindrical part lgseating inan annularde-y pression at the open end ofthe piston, and the se1nicylindricalpart 15 serving as a stop for the edge of the piston at its open end.The `projection 18 has an integral inner medial longi-tudinal rib 17spaced from and parallel withthe cylindrical portion of the shaft 1.Integral with each rib 17 is an inwardly projecting medial boss 20 withupwardlyv and outwardly inclined inner edge of the same angularinclination as the intervening coned part 4 of said shaft seatedcontactingly between the synclinal edges of the' opposed bosses 20. Thefurcations 7 of the block G loosely embrace the abu'ttingparallel partsof said ribs 17 to be lo'ngitudimiln ly slidable therealong whilekeeping said ribs and the projections 18 alined transversely with eachother. The block 6 is held on the shaft part 5 non-slidably between alined collar 8 and a stop pin in the shaft below said block 6.

In case of wear upon the outer face of the piston 21v reducing itsdiameter unsuitably to properly slidably fit the inner cylindrical Wallof an engine cylinder, my device may be used to expand it. The pistonshould be heated to a sufficient amount tothus render its moleculesrelatively movable to the proper amount, and the semi-cylindrical part-s16 with their projections 18 being itted within the open end of thepiston, the parts 18 eX- 9 tending to the circumferential slots 22, theshaft 1 may be rotated to cause the coned part 4 to slidingly pressapart the synclinal edges of the bosses 2() with the projections 18,thus expanding that part of the piston ciroumferentially which isdeiined by the length of the longitudinal slot 23. It willk be notedthat an important feature of this invention is the provision of thestrong assemblage of the transverse guideway body 10 with the guides 12)mounted slidably thereon, whereby when the projections 18 are forcedapart by the coned part 4 of the shaft 1, the projections 18 are throughtheir lengths kept parallel with each other and length of said split 23.Itwill be understood that while the split 23 may be longitudinal` v itmay, as in the usual practise, beslightly inclined to one side, to thusprevent scoring of the wall of a cylinder. i j j When the piston wall iscooled sufliciently, it will have taken a permanent expanded set, andthen the expander device may be easily removed, by rotating the shaft loppositely, thus releasing the projections from the piston. y

Having described my invention, what I' claim new, and desire to secureby Letters Patent, is: 1. In combination, an elongated guideway member ihaving a transverse interiorly threaded*aperture, a medially threadedshaft traversing and withits threads meshed with the threads of saidaperture walls, said shaft having a conical termination, guides aper-`tured to slidingly i'it upon said member at opposite sides of saidshaft and having par allel projections provided with synclinal in` andbe in mesh with said threaded aperture wall, said shaft having a conicalpart with a cylindrical termination, guides apertured to slidingly litsaid guideway on` opposite sides of said 'shaft and having on theirinner opposed faces parallel longitudinal ribs which have opposed medialbosses with 0pposed synclinal faces in contact with oppo-` site sides ofthe conical part of said shaft,

` cal termination, guides apertured to lit upon said guideway slidablyand having parallel projections with outer segmentally cylindrical wallsand having medial longitudinal opposed ribsontheir-inner faceswhich ribshave integral opposed synclinal projections contacting with said conicalshaft part in longitudinal contact therewith, said projections havingoutwardly projecting stop parts at their connections with saidguides,and an oppositely forked block having a medial aperture whereby it ismounted non-slidably and rotatably upon said `cylindrical terminationwith its furcations loosely slidably embracing said ribs to keep saidprojections from relative sidewise displacements.

In testimony whereof I aflix my signature.

FRED TEISINGER.

